VitalyVK wrote:Already received the accreditation, will be there 25-27 and 29

Great Vitaly! As always looking forward to your pictures. Hoping for some good Su-47, MiG-1.44 and T-50 pictures. Also, a small request, if you are going to visit space related stands; please keep an eye out for reusable rocket mock ups and info sheets and such.

There is some confusion about the whole ordeal. It is claimed (who knows by what authority) that this mock up is of "ПСВПС-ЛЛ" which is a testbed for a helicopter with two rotors placed on each side, think Mi V-12. ПСВПС-ЛЛ is developed by Mi using their own funds.

Then there is ПСВ which can mean two things; "Perspective fast helicopter" or "Perspective medium helicopter" which are very different things of course... There are high speed elements for the later so the test bed mock up could be for both. It seems however the high speed project is dead and morphed into "Perspective medium helicopter" and using high speed elements, just not as high speed as the original PSV. http://www.russianhelicopters.aero/en/press/publications/3126.html Sign under the model says Advanced Medium Helicopter, ie the same as "Perspective medium helicopter".

Basically; we don't really know for sure at the moment. Hopefully it will get clear over the course of MAKS, but i think it is unlikely to be for "ПСВПС-ЛЛ", most likely for RACHEL.

Mi-X1 was the original high speed PSV i think so that is dead. Ka-92 is most likely dead too, atleast it is not state funded.

The problem to work on high speed helicopters while using tail/main rotor scheme is the speed limit they have due the advancing blade that creates an asymmetric lift and as soon as it reaches this speed limit it will tilt and at such speeds that can cause a crash.

The problem to work on high speed helicopters while using tail/main rotor scheme is the speed limit they have due the advancing blade that creates an asymmetric lift and as soon as it reaches this speed limit it will tilt and at such speeds that can cause a crash.

Yes... called a retreating blade stall, where the blade moving forward gets extra lift from the forward air speed of the aircraft, while the retreating blade on the other side has to be adjusted to a higher angle of attack to generate the same amount of lift with the flight speed deducted from its rotational speed.

The top speed is limited by the amount of angle the retreating blade can be angled to and still generate lift... when it stalls the advancing blade generates lots of lift, while the retreating blade generates no lift... only drag and the aircraft rapidly rolls and flips over on its back... and normally crashes.

On a coaxial design like the Hokum there are two retreating blades and two forward moving blades so the lift is more balanced.

Great pictures BTW everybody.

_________________“The West won the world not by the superiority of its ideas or values or religion […] but rather by its superiority in applying organized violence. Westerners often forget this fact; non-Westerners never do.”

― Samuel P. Huntington, The Clash of Civilizations and the Remaking of World Order